The Compensation of Y Waveguide Temperature Drifts in FOG with the Thermal Resistor

The lithium niobate integrated optical phase modulator (Y waveguide) is the key device in the digital closed-loop fiber optic gyroscope. However, the half-wave voltage of the lithium niobate changes with the environment temperature, which produces the phase bias drift and ultimately decreases the accuracy of FOG. In this manuscript, the thermal resistor is introduced in the amplification part in the driving circuits of Y waveguide. Due to the characteristic of the thermal resistor, the magnitude of driving voltage on Y waveguide changed with temperature to compensate the electro-optic effects temperature drift of the lithium niobate. This method was proved to improve the performance of fiber optic gyroscopes conveniently in experiment.

Development of a Temperature Sensing System for a Real-Time PCR Instrument

In this paper, we design a temperature sensing system based on a DSP chip TMS320F2812 for a real-time PCR instrument. In this system, we design a 4-wire temperature sensing module with a thermal resistor PT100 to measure the temperature and convert it into a voltage signal. Then the voltage signal is digitalized by the ADC module. At last, the data are transferred to a PC through the serial port. The experimental results show that the linearity of the system is 0.99 with the standard deviation of 0.0419.